title: An improved Abbott ARCHITECT assay for the detection of hepatitis B virus surface antigen (HBsAg).
abstract: BACKGROUND
  The sensitive and accurate detection of hepatitis B virus surface antigen (HBsAg) is critical to the identification of infection and the prevention of transfusion transmitted disease. Improvement in HBsAg assay sensitivity is essential to reduce the window to detect an acute HBV infection. Additionally, the sensitive detection of HBsAg mutants that continue to evolve due to vaccine escape, immune selection and an error prone reverse transcriptase is a necessity.
  
  
  OBJECTIVE
  A fully automated HBsAg prototype assay on the Abbott ARCHITECT instrument was developed to improve sensitivity and mutant detection. This magnetic microparticle-based assay utilizes anti-HBsAg monoclonal antibodies to capture antigen present in serum or plasma. Captured antigen is then detected using anti-HBsAg antibody conjugated with the chemiluminescent compound, acridinium.
  
  
  RESULTS
  The sensitivity of the ARCHITECT HBsAg prototype assay was improved as compared to the current ARCHITECT, PRISM, and competitor HBsAg assays. The enhancement in assay sensitivity was demonstrated by the use of commercially available HBV seroconversion panels. The prototype assay detected more panel members (185 of 383) vs. the current ARCHITECT (171), PRISM (181), or competitor HBsAg assays (73/140 vs. 62/140, respectively). The ARCHITECT prototype assay also efficiently detected all mutants evaluated. Finally, the sensitivity improvement did not compromise the specificity of the assay (99.94%).
  
  
  CONCLUSIONS
  An improved Abbott ARCHITECT HBsAg prototype assay with enhanced detection of HBsAg and HBsAg mutants, as well as equivalent specificity was developed for the detection, diagnosis, and management of HBV infection.
authors.affiliation: Research Assay Prototyping, Diagnostics Research, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA. sheng.lou@abbott.com
authors.forename: Sheng C
authors.initials: SC
authors.lastname: Lou
authors.forename: Sandra K
authors.initials: SK
authors.lastname: Pearce
authors.forename: Teresa X
authors.initials: TX
authors.lastname: Lukaszewska
authors.forename: Russell E
authors.initials: RE
authors.lastname: Taylor
authors.forename: Gregg T
authors.initials: GT
authors.lastname: Williams
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Leary
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D005260:Female; D006509:Hepatitis B / Q000175:diagnosis* / Q000276:immunology / Q000821:virology; D006510:Hepatitis B Antibodies / Q000276:immunology; D006514:Hepatitis B Surface Antigens / Q000097:blood / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*; D006515:Hepatitis B virus / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification*; D006801:Humans; D007118:Immunoassay / Q000379:methods* / Q000592:standards; D008163:Luminescent Measurements / Q000592:standards; D009154:Mutation; D011933:Reagent Kits, Diagnostic / Q000592:standards / Q000821:virology; D012680:Sensitivity and Specificity
chemical_list: D000911:Antibodies, Monoclonal; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D011933:Reagent Kits, Diagnostic